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Type: Posts; User: sergey

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  1. Replies
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    SBC-188...

    SBC-188 can boot MS-DOS 6.22. Its BIOS actually implements INT 10h and INT 16h emulation using serial port.
    What did it take:
    - IBM compatible BIOS. Note that even the entry point addresses are...
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    I mean any differences between 8085/clone CPUs....

    I mean any differences between 8085/clone CPUs. Like, for example, there are some differences between some 8088 variants, or between Z80 clones
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    Just wondering, are you aware of any differences...

    Just wondering, are you aware of any differences between different 8085 implementations?
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    Hi Alan, I ran the test on my MiniMax 8085...

    Hi Alan,

    I ran the test on my MiniMax 8085 with my entire 8085 collection, and they all pass all the tests.

    Here is the list of the CPUs I've tested:

    Intel 8085A, year 1983, week 42:...
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    Thanks! Works perfectly on my Compaq Portable :-)...

    Thanks! Works perfectly on my Compaq Portable :-)

    60939
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    This card only uses IRQ lines on the 16-bit...

    This card only uses IRQ lines on the 16-bit extension, and since it is jumper configurable it doesn't need the ESS configuration utility. So it should work in XT, as long as you are not using...
  7. Oh well, I looked around and haven't found the...

    Oh well, I looked around and haven't found the driver...
    So I hacked the Intel EtherExpress Pro/10 PCI driver to work on this machine.

    Both Intel Professional Workstation and Intel EtherExpress...
  8. Intel Professional Workstation - 82596 Packet Driver

    Hi,

    I have a couple of Intel Professional Workstation (i486) systems that have an onboard 82596 Ethernet controller.
    I am wondering if a packet driver exists for this machine?

    Potentially I...
  9. It is probably a good idea to have a 74*245...

    It is probably a good idea to have a 74*245 transceiver there. It will buffer/amplify the CF data bus signals. It shouldn't hurt in any case ;-)
  10. One advantage of using multiple pull-up resistors...

    One advantage of using multiple pull-up resistors on unused inputs/gates is that it makes it easier to mod the board in the future without cutting any PCB traces.
    And, actually that is also the...
  11. I found this 10 years old and very lengthy thread...

    I found this 10 years old and very lengthy thread that discusses the performance differences between CGA and VGA. It specifically refers to Alley Cat - see post #11.
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    Sorry for delay. I've sent you a PM.

    Sorry for delay. I've sent you a PM.
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    You could use a ROM disk and a battery backed up...

    You could use a ROM disk and a battery backed up SRAM disk (or potentially EEPROM or Flash ROM) as your block device.
    Is there any particular reason you want to use 8251 USART? There are better,...
  14. I remember trying that game on my Micro 8088...

    I remember trying that game on my Micro 8088 system, and I don't remember having such issues. I'll try to test it again...
  15. There are a few on eBay, although they are quite...

    There are a few on eBay, although they are quite pricey. You can also try getting a quote from https://www.utsource.net
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    I don't think it clears IF... Otherwise it would...

    I don't think it clears IF... Otherwise it would have to remember to restore it after the next instruction. It is handled by microcode...
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    Sure, you can use it.

    Sure, you can use it.
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    Just the parts cost and shipping: The ROMs price...

    Just the parts cost and shipping: The ROMs price seems to be $2 for two OTP 27C256, or about $10 for two UV EPROM 27C256. The shipping is $5 for a small USPS First Class package.
    So the total is...
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    I can burn them for you. But I am not sure I have...

    I can burn them for you. But I am not sure I have any 27256/27C256 available, I can check my parts boxes later today. If anything, local surplus store has OTP 27C256 ROMs for $1 each:...
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    Yes, Intel 8088 processors marked as...

    Yes, Intel 8088 processors marked as "(C)INTEL'78" have this bug. Intel processors with a later copyright year, for example "(C)INTEL '78 '81" and "(C) INTEL '78 '83" don't have it.
    I've never...
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    I am assuming you're talking about POP SS/MOV SS...

    I am assuming you're talking about POP SS/MOV SS bug.

    It is not a serious issue :-)
    First of all you're not using your PC clone for anything serious (I hope).
    Second, the workaround is normally...
  22. It works better?! :-) The IBM PC/XT DMA...

    It works better?! :-) The IBM PC/XT DMA implementation is horrible... Instead of using proper 8088 bus request/grant signals. DMA logic "steals" the bus from CPU by inserting wait cycles, and...
  23. Questions: What is that you're trying to do with...

    Questions:
    What is that you're trying to do with the serial card?
    How do you know the card does not work?
    What kind of serial cards? (just serial or multi I/O)?
    Can you post the photos of the...
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    Before trying to get an output on your EGA card...

    Before trying to get an output on your EGA card and composite monitor, can you test the board with something more common? CGA (you can use the composite output if you like), an known working 8-bit...
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    I am wondering if there is more stuff going on...

    I am wondering if there is more stuff going on behind the scenes other than MD flag change. This note particularly looks interesting (page 8-5 here):

    EMULATION NESTING
    In a native mode called by...
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